

FIG. 44. Hydra. A, vertical section of entire animal ; B, portion of transverse 

 section, highly magnified ; C, two large ectoderm cells ; D, endoderm cell of 

 H. viridis ; E, large nematocyst ; F, small nematocyst ; G, sperm ; , ingested 

 diatom ; bd.^, bd.~, buds ; chr. chromatophores ; cnbl. cnidoblast ; cnc. cnidocil ; 

 ect. ectoderm ; end. endoderm ; ent. cai>. enteric cavity ; ent. cav' . its prolonga- 

 tion into the tentacles ; JJ. flagellum ; hyp. hypostome or manubrium ; int. c. in- 

 terstitial cells; m.pr. muscle processes; mth. mouth ; nisgl. mesogloea ; ntc. 

 large, and ntc . small nematocysts ; nu. nucleus ; or. ovum ; ovy. ovary ; psd. 

 pseudopods ; spy. spermary ; vac. vacuole. 



